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Thread: 277/480 Wye connected phase colors.

  1. #1
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    277/480 Wye connected phase colors.

    Hi everyone, I would like to understand litter more about transformers, here is my question, I see that the 277/480 Wye connected phase colors are Brown, Purple, Yellow, Gray for grounded, but why some 277/480 Wye system have the phase B called High leg Delta and colored in Orange? so far the only delta system I know have (120/240 and is called Delta High leg) why to the phase in a Wye system a delta ? hope i explain this right, sorry for my typing I'm learning the language.

  2. #2
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    It is not a high leg on a wye system, you basically can use any color you want to identify the system, orange replaced purple as a somewhat industry standard ( here we go again ) Orange is easier to distinguish from brown than purple is. Some states and localities still use YBP, but most now use BOY.

  3. #3
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    Quote Originally Posted by hillbilly1 View Post
    It is not a high leg on a Wye system, you basically can use any color you want to identify the system, orange replaced purple as a somewhat industry standard ( here we go again ) Orange is easier to distinguish from brown than purple is. Some states and localities still use YBP, but most now use BOY.
    Thank you, I got very confused today at work when I taped a feeders to main wires in a gutter with a 277/480 system and I saw a phase in orange, I used purple tape to identify my phase but I will change it to orange on Monday...Thank you !!

    have a nice weekend !!

  4. #4
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    It was around the early to mid 80's when the change happened.

  5. #5
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    I understand BOY has been around for a long time, but I will not use orange for any wire that isn't on a high leg. I prefer RYB.

  6. #6
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    Quote Originally Posted by Hv&Lv View Post
    I understand BOY has been around for a long time, but I will not use orange for any wire that isn't on a high leg. I prefer RYB.
    Unless of course you work in a building that is already designated as boy (277/480) and brb (120/208). You must maintain the designated color code. In some cases it may even be in the spec for the job or facility or property maintenance.
    Brian H. " No, I think you mis-understood. I said I'm an electrician, not a magician."

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